If your Flak Jacket lenses took a beating on your last endo, or you're just looking to switch things up, the Oakley Flak Jacket Standard Replacement Lenses are ready to spice up your frames. Swap these lenses out in a few seconds for a darker or lighter lens tint that suits your style and lighting conditions. Oakley replacement lenses offer distortion-free vision and block 100% of all UVA, UVB and UVC rays, so you're covered no matter what tint you choose. Proposition 65 Warning for California Consumers: This product contains chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm.